脫韁之馬 [脱缰－马]

Jyutping tyut3 goeng1 zi1 maa5
Pinyin tuō jiāng zhī mǎ

Definitions (CC-CEDICT)
  1. lit. a horse that has thrown off the reins (idiom); runaway horse
  2. out of control
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）